Abstract
This essay is the subject of national eleventh five support schemes: The analysis of key technology on emission reduction and comprehension utilization of solid waste from large iron ore mine (Number:2008BAB32B14).For the concrete with ultra-fine iron tailings the research on the new special cement has been successfully prepared by means of using a low dosage of crystal-core-element named CCE for short (which has an excellent capability to accelerate the hydration speed and develop the strength of the cement)and high percentage of blast furnace slag and other several industrial residue. Compared to the ordinary Portland cement grade 42.5, the new cement has several outstanding virtues such as lower use level of cement clinker, higher level usage of industrial residue and lower cost. According to the cement standard GB175-2007, strength of special cement sample NO.3 is same as the ordinary Portland cement grade 42.5 with the standard sand. When with ultra-fine iron tailings, the new special cement has higher strength after 28days than the OPC. That shows the special cement has an excellent long-term performance of concretion. The manufacturing cost of the new special cement sample NO.3 is decreased by 20.76% than the ordinary Portland cement grade 42.5, that will bring a great environment and economic effect.
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